package com.wangkang.ucenter.mapper;
import com.wangkang.ucenter.entity.Member;
import com.baomidou.mybatisplus.core.mapper.BaseMapper;


public interface MemberMapper extends BaseMapper<Member> {

    /**
     * 查询指定day的注册人数
     * @param day 指定日期
     * @return 注册日期
     */
    Integer countRegisterDay(String day);
}
